History of the Telephone

Time span

Period: Sep 19, 1940 to Sep 19, 1950

Bell Labs

Sep 19, 1941

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The first touch tone system which was used tones in the voice frequency range rather than pulses generated by rotary dials.This increased the speed of dailing for the telephone.

Bell Labs

Sep 19, 1946

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The first mobile telephone call from a car occured. A driver pulled out a phone out of his dash board and made a call.

Bell Lab

Sep 19, 1946

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The first commercial mobile phone was installed. It was istalled in St. Loius.

Att

Sep 19, 1947

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Research into cell phone technology began with an examination of the limited mobile phones of the time. Scientists think by using small cells will increase the traffic of phone calls.

Bell Labs

Sep 23, 1947

sourceCellular telephone service concieved by D.H. Ring at Bell Labs. This technology didn't actually exist.

Bell Labs

Sep 23, 1948

sourceError detecting coding, first developed for telephone switching is now used throughout the computing and telecommunication industries. Bell Labs developed a general theory for error correcting theorys.

Att

Sep 23, 1948

sourceThe wireless telephone service was available in almost 100 cities and highway corridors. This helps because this makes the phones buisness grow.

Bell Labs

Sep 23, 1948

sourceAfter World War 2 the phone buisness had to hurry up because of the loss. In the rest of the year their was 30,000,000 phone services.